#### The rate constant of the reaction A B is 0.6 x 10-3 mole per second. If the concentration of A is 5 M, then concentration of B after 20 minutes is: Option 1) 1.08 M Option 2) 3.60 M Option 3) 0.36 M Option 4) 0.72 M

As learnt in

nth order reaction -

The rates of the reaction is proportional to nth power of reactant

- wherein

Differential rate law

Integrated rate laws,

a= initial, concentration of reactant at t=0 sec

x= concentration of product formed at t= tsec

Reaction is of zero order as the unit of rate constant is mol L-1  s-1

concentration = K t

= 0.6 x 10-3 x 20 x 60 M

= 0.72 M

Option 1)

1.08 M

Option 2)

3.60 M

Option 3)

0.36 M

Option 4)

0.72 M